<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色列表区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addRolesDialogVisible = true">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bd-bottom', i1 === 0 ? 'bd-top' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
             <el-col :span="5">
               <el-tag  closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
               <i class="el-icon-caret-right"></i>
             </el-col>
              <!-- 渲染二级和三级权限 -->
             <el-col :span="19">
               <!-- 通过for循环嵌套渲染二级权限 -->
               <el-row :class="[i2 === 0 ? '' : 'bd-top', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                 <el-col :span="6">
                   <el-tag type="success"  closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                   <i class="el-icon-caret-right"></i>
                 </el-col>
                 <el-col :span="18">
                   <!-- 通过for循环渲染出三级权限 -->
                   <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                 </el-col>
               </el-row>
             </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditRoleDialog(scope.row.id)">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeRoleById(scope.row.id)">删除</el-button>
            <!-- 通过scope.row把当前的node节点传进去 -->
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 添加角色对话框 -->
    <el-dialog
      title="添加角色"
      :visible.sync="addRolesDialogVisible"
      width="50%" @close="addRolesDialogClosed">
      <!-- 内容主体区域 -->
      <el-form status-icon :model="addRolesForm" :rules="addRolesFormRules" ref="addRolesFormRef" label-width="80px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addRolesForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addRolesForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 对话框底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addRolesDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRoles">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改角色的对话框 -->
    <el-dialog
      title="修改角色"
      :visible.sync="editRoleDialogVisible"
      width="50%"
      @close="editRoleDialogClosed">
      <!-- 内容主体区域 -->
      <el-form status-icon :model="editRoleForm" :rules="editRolesFormRules" ref="editRolesFormRef" label-width="80px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editRoleForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editRoleForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleInfo">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList" ref="treeRef" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>

export default {
  data() {
    return {
      // 所有角色列表数据
      roleList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id值数组
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: '',
      // 控制添加角色对话框的显示与隐藏
      addRolesDialogVisible: false,
      // 添加角色的表单数据
      addRolesForm: {
        roleName: '',
        roleDesc: ''
      },
      // 添加角色表单的验证规则对象
      addRolesFormRules: {
        roleName: [
          { required: true, message: '请输入角色名', trigger: 'blur' },
        ],
        roleDesc: [
          { required: true, message: '请输入角色描述', trigger: 'blur' },
        ]
      },
      // 控制修改角色对话框的显示与隐藏
      editRoleDialogVisible: false,
      // 查询到的角色信息对象
      editRoleForm: {},
      // 修改角色的验证规则对象
      editRolesFormRules: {
        roleName: [
          { required: true, message: '请输入角色名', trigger: 'blur' },
        ],
        roleDesc: [
          { required: true, message: '请输入角色描述', trigger: 'blur' },
        ]
      }
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const {data: res} = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.roleList = res.data
    },

    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        // 则说明用户不想删除
        return this.$message.info('已取消删除')
      }

      const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      // await this.getRolesList()
      role.children = res.data
    },

    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const {data: res} = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败!')
      }
      // 把获取到的权限数据保存到data中
      this.rightsList = res.data
      console.log(res.data)

      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)

      this.setRightDialogVisible = true
    },

    // 通过递归的形式获取角色下所有三级权限的ID
    // 并保存到 defKeys 数组中
    getLeafKeys(node, arr) {
      // 如果当前node节点，不包含children属性则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      // 递归遍历获取到三级节点的id
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击确定为角色分配权限
    async allotRights() {
      const keys = [
        // 返回目前被选中节点的key所组成的数组
        ...this.$refs.treeRef.getCheckedKeys(),
        // 返回目前半选中的节点所组成的数组
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      // 以逗号进行拼接
      const idStr = keys.join(',')

      const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr})
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败!')
      }
      this.$message.success('分配权限成功!')
      await this.getRolesList()
      this.setRightDialogVisible = false
    },
    // 添加角色对话框的关闭事件
    addRolesDialogClosed() {
      this.$refs.addRolesFormRef.resetFields()
    },
    // 点击添加角色，添加新角色
    addRoles() {
      this.$refs.addRolesFormRef.validate(async valid => {
        if (!valid) return
        // 可以发起添加角色的网络请求
        const {data: res} = await this.$http.post('roles', this.addRolesForm)
        if (res.meta.status !== 201) {
          this.$message.error('添加角色失败')
        }
        this.$message.success('添加角色成功!')
        // 隐藏添加角色对话框
        this.addRolesDialogVisible = false
        // 重新获取角色列表数据
        await this.getRolesList()
      })
    },
    // 展示编辑角色的对话框
    async showEditRoleDialog(id) {
      const {data: res} = await this.$http.get('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询用户信息失败!')
      }
      this.editRoleForm = res.data
      this.editRoleDialogVisible = true
    },
    // 修改角色对话框的关闭事件
    editRoleDialogClosed() {
      this.$refs.editRolesFormRef.resetFields()
    },
    // 修改角色并确认提交
    editRoleInfo() {
      // 表单预校验
      this.$refs.editRolesFormRef.validate(async valid => {
        // valid值为true则代表校验通过
        if (!valid) return
        // 发起修改角色信息的数据请求
        const {data: res} = await this.$http.put('roles/' + this.editRoleForm.roleId, {
          roleName: this.editRoleForm.roleName,
          roleDesc: this.editRoleForm.roleDesc
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改角色信息失败!')
        }
        // 关闭对话框
        this.editRoleDialogVisible = false
        // 刷新数据
        await this.getRolesList()
        // 提示修改成功
        this.$message.success('更新角色信息成功!')
      })
    },
    // 根据id删除对应的角色信息
    async removeRoleById(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }

      // 删除角色
      const {data: res} = await this.$http.delete('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除角色失败!')
      }
      this.$message.success('删除角色成功!')
      await this.getRolesList()
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag {
    margin: 7px;
  }

  .bd-top {
    border-top: 1px solid #eee;
  }

  .bd-bottom {
    border-bottom: 1px solid #eee;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
